CodePen-ception Explained

January 29, 2016

In the CodePen Editor View, the preview pane is essentially a browser window (it's an <iframe> of your code). It does just about everything a normal browser window does, including opening links in the same window. Unless—it's told to do otherwise.

So, if you put a link to CodePen inside your Pen, you can end up with CodePen-ception — CodePen-in-a-Pen (hat tip to John Chin-Jew, who coined the term).